Overseas tonight it is the biggest offensive against ice is yet American troops helping the Iraqis US airstrikes. Thousands of Iraqi troops advancing on Mosul and take a look tonight Iraqi forces approaching the city a lot of tanks there and watch the left side of your screen. Ice is responding with suicide bombers inside cars. Driving right toward those tanks at least a dozen attacks like that when there already ABC's Alex Moore court on the front lines in Iraq tonight it's just. After dawn Iraqi tanks rolled into battle. Artillery and airstrikes pounded ice is positioned. The offensive officially underway to retake Mosul for myself. That was one of the rockets heading out down toward into the plains. Around the city of sun has come up. But as the day wore on the terrorist groups showed it was not going down without a fight. This suicide truck bomber careened into a line of Iraqi tanks that exploded. Giant flames shooting towards the sky. Another strode toward the Kurdish conflict the troops yelled at this spot Steve tasker and the sound of the explosion. Ice is claimed twelve suicide bombings and the battle today. Backing the anti ice is forces American troops advising and calling in airstrikes like those we saw throughout the day on a Kurdish base. That progress seen from a drone abandoned villages that the advancing forces now warn may be booby trapped. The fighters tell us that the biggest obstacle to their dance is the deadly IDD's all along the road so even with considerably greater firepower. Moving forward can be complicated and slow going.

This transcript has been automatically generated and may not be 100% accurate.

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